[milo] Actually display blamelist if >50 commits
[milo] Actually display blamelist if >50 commits

Bug: 832875
Change-Id: I2b3498cca56c65e2f2741abad59a8c1e3a1beb71
Reviewed-on: https://chromium-review.googlesource.com/1012747
Reviewed-by: Andrii Shyshkalov <a30c74fa30536fe7ea81ed6dec202e35e149e1fd@chromium.org>
Commit-Queue: Ryan Tseng <2190fe9a39b4920ec7bd59c848ec5cccd163056f@chromium.org>

luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go